Performance of Bermed Revetments

Laboratory tests with irregular waves to determine wave run-up characteristics and armor stability of riprap revetments are discussed. Tests include conventional, plane, 1-on-2 slope revetments and conventional revetments fronted by rubble berms. Rubble berms tested herein reduced the maximum run-up by rather modest amounts, up to about 20% but typically around 10%, but they produced substantial improvement in the armor stability. These effects are discussed and quantified. This study demonstrates the need for a reliable irregular wave run-up gauge for laboratory studies of rough, porous coastal structures.